The CAS Registry Mumber 11099-25-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,9 and 9 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 11099-25: (7*1)+(6*1)+(5*0)+(4*9)+(3*9)+(2*2)+(1*5)=85 85 % 10 = 5 So 11099-25-5 is a valid CAS Registry Number.
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